Best youth first base mitts, by the age of the kid holding one

A mitt is not a glove

The words get used interchangeably in the stands and they are not the same object. A fielding glove has individual finger stalls and a web you can pinch shut. A mitt — first base and catcher are the only two positions that use one — has no separate fingers inside, a longer and flatter profile, and a deep scoop built to receive a throw rather than to field a ground ball.

That difference drives everything else on this page. A mitt closes in one hinge along its whole length, so the question is not "does it fit his hand" but "can he generate enough squeeze to shut it before the ball bounces out." A 9-year-old with a 12.5 in mitt cannot. That is why the ranking below starts with the smallest real mitt rather than the best leather.

If your kid is not actually playing first base — if the coach just rotates everybody through it — he does not need a mitt at all. A normal fielding glove is legal at first base in every youth league. Start at best youth baseball gloves instead and come back here when the position sticks.

What size first base mitt by age

First base mitts are measured the long way, from the heel to the top of the pocket, the same as any glove. They run longer than the fielding glove a kid of the same age would use, but not by as much as the adult patterns in a sporting goods store suggest. Rawlings publishes a glove-size-by-age table on its own product pages: ages 8 to 10 at 10.5 to 11.5 in, ages 11 to 13 at 11.5 to 12.25 in. For a mitt, the top of each band is the right place to shop.

The rulebook limit, quoted

Every mitt on this page is well inside that limit, and so is every youth first base mitt sold in the United States, so this is not a rule you need to shop around. It is worth knowing for the opposite reason: a parent who sees a 13 in adult mitt online and assumes bigger is better is buying the largest legal mitt for a kid who cannot close a 12 in one. The rule sets a ceiling, not a target.

League rules on what a kid may wear are a separate question from bat certification, which is the one that actually gets a kid sent back to the dugout. That is covered on USA vs USSSA vs BBCOR.

How these were ranked

Gloves and mitts on this site are scored on size fit for the age, ease of close for small hands, leather and build quality, break-in effort and value, with the weights published on the methodology page. On a first base mitt the first two metrics carry the page, because a mitt that a kid cannot shut is not a worse mitt — it is a liability at the position.

We do not own or test this gear. Sizes, webs, patterns and throwing hand were read from the live Amazon listing each buy button points at on 14 October 2026, the size-by-age bands come from Rawlings' published table, and the rule above is quoted from the Official Baseball Rules. Where a maker does not publish a leather grade for a youth mitt — most of them do not — we have not invented one.

The left-handed problem

First base is the one infield position where left-handed players have a real advantage, and youth teams know it, so a disproportionate number of kids asked to play first throw left-handed. Then the parent discovers that roughly nine out of ten mitts on the shelf are right-hand throw, and the left-hand version — when it exists — is a separate listing at a higher price with one colorway.

Two things help. First, check the throwing hand in the listing title before anything else; "RHT" means the mitt goes on the left hand, for a player who throws with his right. Second, of the mitts here, the Mizuno GXF102 is the one whose left-hand-throw version is reliably stocked, which is why it is the default recommendation for a lefty even when another mitt would score a point higher.

The rest of it — how to tell which hand your kid throws with, why the stock is thinner, and the positions a left-hander ends up playing — is on left-handed youth gloves explained.

Breaking one in before the next game

A mitt has more leather and one long hinge, so it breaks in slower than a fielding glove and it breaks in in a different place: you are shaping the hinge, not the pocket. Play catch with it, catch throws rather than grounders, and close it by hand while watching television. A mallet pounded into the hinge line does more good than one pounded into the pocket.

What not to do is the same list as for any glove: no oven, no microwave, no soaking, and go very easy on the oil. The full method, including what actually dries leather out, is on how to break in a baseball glove, and the care routine afterwards is on how to clean and care for a glove.

Budget two weeks. If the coach needs a first baseman on Saturday, the Franklin is in the bag for a reason — a soft cheap mitt catches more on day one than a stiff good one.

The three 11.5-12 in mitts, side by side

Read that table as three answers to one question: how old is the kid. The Rawlings is the small one, the Mizuno is the one that fits for three seasons, and the Wilson is the same size as the Mizuno with a better shell and a higher price. There is no version of this page where a 9-year-old should be in the Wilson.

Before you buy

• Confirm he actually plays first. A fielding glove is legal there. A mitt is a positional purchase, and it is a bad general-purpose glove.
• Check the throwing hand in the title. RHT means it goes on the left hand. Left-hand-throw mitts are separate listings, usually dearer, often out of stock.
• Size to the hand, not to the position. 11.5 in for 8 to 11, 12 in from about 10. The rulebook ceiling of 13 in is not a shopping target.
• Do the ten-squeeze test before the first game, not during it.
• Allow two weeks of break-in on the leather mitts, or buy the cheap soft one if the game is Saturday.
• Check the current price on the listing. Glove prices move week to week and every size and color is its own listing; the button on each card shows what that exact one costs today.